EP0199272A3 - Monochromatic representation of color images - Google Patents

Monochromatic representation of color images Download PDF

Info

Publication number
EP0199272A3
EP0199272A3 EP86105237A EP86105237A EP0199272A3 EP 0199272 A3 EP0199272 A3 EP 0199272A3 EP 86105237 A EP86105237 A EP 86105237A EP 86105237 A EP86105237 A EP 86105237A EP 0199272 A3 EP0199272 A3 EP 0199272A3
Authority
EP
European Patent Office
Prior art keywords
color
character
image
monochromatic
characters
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86105237A
Other languages
German (de)
French (fr)
Other versions
EP0199272A2 (en
Inventor
William T. Haggerty
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wang Laboratories Inc
Original Assignee
Wang Laboratories Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wang Laboratories Inc filed Critical Wang Laboratories Inc
Publication of EP0199272A2 publication Critical patent/EP0199272A2/en
Publication of EP0199272A3 publication Critical patent/EP0199272A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G09G5/028—Circuits for converting colour display signals into monochrome display signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/40012—Conversion of colour to monochrome
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K2215/00—Arrangements for producing a permanent visual presentation of the output data
    • G06K2215/0082—Architecture adapted for a particular function
    • G06K2215/0094—Colour printing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2044—Display of intermediate tones using dithering
    • G09G3/2051—Display of intermediate tones using dithering with use of a spatial dither pattern

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Hardware Design (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Color Image Communication Systems (AREA)
  • Image Processing (AREA)
  • Digital Computer Display Output (AREA)
  • Image Generation (AREA)

Abstract

Forming a character-based monochromatic image from a digital representation of a color image by (1) forming a character-based representation of the colour image in which a plurality of color characters each describe the background and foreground color within a defined area of the colour image, (2) providing a plurality of color pattern masks each corresponding to a color in the color image and comprised of a pattern of light and dark dots capable of providing, in the monochromatic image, visual discrimination between areas of different color, (3) transforming the color characters to monochromatic characters by replacing the background and foreground colors of each color character with the corresponding pattern of light and dark dots, and (4) displaying the monochromatic characters on a character-based output device (e.g., a CRT display driven by a character-based controller).
EP86105237A 1985-04-16 1986-04-16 Monochromatic representation of color images Withdrawn EP0199272A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/723,732 US4703318A (en) 1984-03-30 1985-04-16 Character-based monochromatic representation of color images
US723732 1985-04-16

Publications (2)

Publication Number Publication Date
EP0199272A2 EP0199272A2 (en) 1986-10-29
EP0199272A3 true EP0199272A3 (en) 1989-09-20

Family

ID=24907428

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86105237A Withdrawn EP0199272A3 (en) 1985-04-16 1986-04-16 Monochromatic representation of color images

Country Status (5)

Country Link
US (1) US4703318A (en)
EP (1) EP0199272A3 (en)
JP (1) JPS61281370A (en)
AU (1) AU587608B2 (en)
CA (1) CA1257938A (en)

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US4297693A (en) * 1976-06-21 1981-10-27 Texas Instruments Incorporated Apparatus for displaying graphics symbols
EP0158902A2 (en) * 1984-03-30 1985-10-23 Wang Laboratories Inc. Monochromatic representation of color images

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Also Published As

Publication number Publication date
US4703318A (en) 1987-10-27
AU5533786A (en) 1986-10-23
JPS61281370A (en) 1986-12-11
EP0199272A2 (en) 1986-10-29
AU587608B2 (en) 1989-08-24
CA1257938A (en) 1989-07-25

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Inventor name: HAGGERTY, WILLIAM T.